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b. 2x³y +13x²y² -8xy³
= x² - 10x² - 3xy - 2xy + 5y² - y²
= 9x² - 5xy + 4y²
= 9x² + 4y² - 5xy
b. 5xy (x² + 2xy - y²) - 3y (x³ - x²y + xy²)
= 5x³y + 10xy² - 5xy³ - 3x³y + 3x²y² - 3xy³
= 5x³y - 3x³y + 10xy² - 5xy³ - 3xy³ + 3x²y²
= 2x³y + 10xy² - 8xy³ + 3x²y²